Attestic is an OpenAI-compatible gateway. Point an existing application at it and every response is signed, chained to the one before it and verifiable by anyone holding the public key. It works with the models an organisation already uses.
Illustrative receipt. Values shortened for display.
Five receipts are hashed in your browser with SHA-256, each over the hash before it. Edit the output of #000184 227. Verification walks from the first receipt, so the edited one fails and nothing after it can be anchored. The 3D chain follows every keystroke.
Five receipts linked by their hashes.
Illustrative. Hashes are real SHA-256 values computed on this page. Signatures and Merkle proofs are left out.
Attestic speaks the OpenAI API, so an existing client points at the gateway instead of the model provider. Requests pass through to the models the organisation already uses, and every response comes back signed and chained.
Each response carries an Ed25519 signature over the request and the output.
Receipts are hash-chained, so altering one breaks every receipt after it.
Merkle roots let an auditor verify a single response without the full log.
from openai import OpenAI # Only the base URL changes. client = OpenAI( base_url="https://<gateway>/v1", api_key="<attestic-key>", ) reply = client.chat.completions.create( model="<your-model>", messages=[{"role": "user", "content": "Summarise the Q3 exposure."}], ) # The response comes back signed and chained.
Host, key and model are placeholders.
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